US PATENT SUBCLASS 219 / 505
.~.~.~.~ Comprising nonlinear or negative temperature coefficient resistance means

Current as of: June, 1999
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219 /   HD   ELECTRIC HEATING

200  DF  HEATING DEVICES {14}
482  DF  .~ With power supply and voltage or current regulation or current control means {4}
490  DF  .~.~ Automatic regulating or control means {11}
504  DF  .~.~.~ Comprising variable resistance means {1}
505.~.~.~.~ Comprising nonlinear or negative temperature coefficient resistance means

DEFINITION

Classification: 219/505

(under subclass 504) Subject matter wherein the structure includes a nonlinear or negative temperature coefficient of resistance resistor device or devices.

SEE OR SEARCH THIS CLASS, SUBCLASS:

494, for heater control systems utilizing thermally responsive resistors, for example.

501, for heater control systems utilizing semiconductor means, e.g., transistor.

SEE OR SEARCH CLASS

338, Electrical Resistors,

22+, for current or voltage responsive thermistors, per se, and subclasses 25+ for ambient temperature responsive or adjustable resistors. 361, Electricity: Electrical Systems and Devices,

161+, for control circuits for electromagnetic devices including a thermal device, e.g., thermistors.